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misc: Optimize flash and memory usage.#270
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iabdalkader commentedNov 21, 2025
FYI@pillo79@pennam for some reason enabling log level=4 (debug for everything) causes a hardfault on Portenta-H7. It shouldn't be a stack overflow issue, but I tried increasing all stacks anyway and it doesn't help. That said, it is very convenient and I have been using it locally, instead of adding debug options manually to conf files, so I will get it fixed somehow and let you know. |
0df6fb2 to46d57bdCompareiabdalkader commentedNov 21, 2025
Actually, it turns out that it's just some log thread overflow, fixable by increasing stack sizes. However,, I decided to Not enable debug logs globally, because we don't really have extra memory for that and it makes it much harder to see the debug log you're looking for. |
46d57bd to0cf7454CompareAdd debug config fragment to easily build debug images.Usage: ./extra/build.sh <board> --debugThe build includes extra/debug.conf which enables:- Debug mode with assertions and verbose output- Debug-level logging (level 4)- Stack overflow detection- Thread monitoring- Debug optimizations (-Og)- Enable shell.Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
0cf7454 toccd08d2CompareThe created sketch log structures depends on the config:CONFIG_LOG (IMMEDIATE/DEFERRED): creates log_const_sketch struct.CONFIG_LOG_RUNTIME_FILTERING (implied by CONFIG_SHELL): creates log_dynamic_sketch struct.CONFIG_LOG_MODE_IMMEDIATE + CONFIG_SHELL: creates both.Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
Replace the libc's malloc, free etc.. with wrappers that redirectmemory allocation Zephyr's kernel heap functions (k_malloc/k_free).Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This saves about 70KBs FLASH and ~47KBs RAM. The saved memoryis used to increase mbedtls heap to support cert loading, andthe remaining added to main heap.Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
ccd08d2 to3fed70aCompareSigned-off-by: iabdalkader <i.abdalkader@gmail.com>
3fed70a to5d1e8f5Compare
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This PR optimizes flash and memory usage, saving up to ~80KBs flash and ~50KBs RAM on some boards, by disabling the shell for production builds, CPP and using a unified heap for Zephyr and sketches. The saved memory is used to increase mbedtls heap to support cert loading, and the remaining added to main heap. For Portenta, ~100KBs should be available to user sketches.
Changes:
To build debug images use:
./extra/build.sh <board> --debugThe build includes extra/debug.conf which enables: